Implement join(self, join: str) for PaymentsCallBuilder

[KStasi]

Is your feature request related to a problem? Please describe.
Native Horizon API allows query option ?join for payments https://www.stellar.org/developers/horizon/reference/endpoints/payments-for-account.html
This is quite handy because it reduces the number of requests needed to get all information about transactions with payments without fetching unrelated operations.

Describe the solution you'd like
Add method for PaymentsCallBuilder similar to

py-stellar-base/stellar_sdk/call_builder/operations_call_builder.py

Lines 84 to 91 in c571012

	def join(self, join: str) -> "OperationsCallBuilder":
	"""join represents `join` param in queries, currently only supports `transactions`
	:param join: join represents `join` param in queries, currently only supports `transactions`
	:return: current OperationsCallBuilder instance
	"""
	self._add_query_param("join", join)
	return self

[overcat]

Thanks for your response, released in 2.5.1.